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Assertion : Magnetic moment of toroid is zero.
Reason : Magnetic field outside the volume of current carrying toroid is zero. 

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Important Questions on Magnetic Effect of Current

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NEET
IMPORTANT
Beta Question Bank for Medical: Physics>Chapter 25 - Magnetic Effect of Current>Exercise (Assertion & Reason)>Q 161
Assertion :-A current carrying wire is placed in magnetic field, then magnetic force may acts on it.
Reason : Free electrons and positive ions are in motion inside any current carrying wire.
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Beta Question Bank for Medical: Physics>Chapter 25 - Magnetic Effect of Current>Exercise (Assertion & Reason)>Q 162
Assertion : A current carrying toroid is freely suspended in uniform magnetic field then torque acts on it is always zero.
Reason : The magnetic moment of current carrying toroid is zero. 
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Beta Question Bank for Medical: Physics>Chapter 25 - Magnetic Effect of Current>Exercise (Assertion & Reason)>Q 164
Assertion : If a charged particle is moving in perpendicular uniform magnetic field, its kinetic energy does not change
Reason : Velocity of charge particle is not changing in magnetic field.
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Beta Question Bank for Medical: Physics>Chapter 25 - Magnetic Effect of Current>Exercise (Assertion & Reason)>Q 165
Assertion : Unlike charges are projected in opposite direction in transverse magnetic field, then they are deflected mutually opposite directions.
Reason : If velocity of two charge particles are in opposite direction in transverse magnetic field then force will be opposite direction.
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Beta Question Bank for Medical: Physics>Chapter 25 - Magnetic Effect of Current>Exercise (Assertion & Reason)>Q 166
Assertion : A current element is a source of magnetic field.
Reason : A moving charge is a source of magnetic field.
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Beta Question Bank for Medical: Physics>Chapter 25 - Magnetic Effect of Current>Exercise (Assertion & Reason)>Q 167
Assertion : The trajectory of neutron when it is projected perpendicular to an electric field is parabola.
Reason : A moving charge entering parallel to the magnetic field lines moves in a circular path. 
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IMPORTANT
Beta Question Bank for Medical: Physics>Chapter 25 - Magnetic Effect of Current>Exercise (Assertion & Reason)>Q 168
Assertion : Various regular polygons formed by a constant length current carrying wire, then magnetic induction at their centres are increases when their number of sides increases.
Reason : A magnetic dipole placed in non uniform magnetic field, then torque acting on it is always zero.
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Beta Question Bank for Medical: Physics>Chapter 25 - Magnetic Effect of Current>Exercise (Assertion & Reason)>Q 169
Assertion : A planar circular loop of area A and current I is equivalent to magnetic dipole of dipole moment M = IA.
Reason : At large distances, magnetic field of circular loop and magnetic dipole is same.